Study reveals distinct patterns across single-, multi-, and mass homicides

A recent study analyzing U.S. homicide data reveals distinct patterns across single-, multi-, and mass homicides. According to the research published in Annals of Epidemiology, intimate partner violence (IPV) often leads to mass homicide and is frequently associated with multi-victim and single-victim deaths. The study categorizes homicides into three types: single-victim (90.5% of 115,873 deaths), multi-victim (8.7%), and mass (1%), each exhibiting unique demographics and circumstances.

In 2018-2023, the majority of U.S. homicide deaths were single-victim cases, but multi-victim homicides claimed 10,123 lives across 4,789 events. This percentage of multi-victim homicide deaths is higher than previously reported from 2003-2017. Mass homicides, accounting for less than 1% of total deaths, resulted in 892 fatalities across 178 incidents, with individual cases spanning from 4 to 51 fatalities.

Most mass and multi-victim homicides occurred in homes, while single homicides most often took place in public locations like streets or vehicles.

Demographically, mass homicides more often involved non-Hispanic (NH) White victims and children, while single-victim and multi-victim homicides more frequently involved NH Black victims and acquaintances or friends as suspects. The findings emphasize the importance of tailoring prevention strategies to the differences among these homicide types.

Patrick S. Sullivan, DVM, Ph.D., editor in chief of Annals of Epidemiology, notes that the analysis highlights how public data systems can reveal that homicide is not a single problem but several distinct issues, each with its own affected populations and precipitating circumstances. The study offers valuable insights for policymakers and interventions aimed at reducing these tragic and preventable outcomes.